The Emmy winner, 43, cited "irreconcilable differences" in the documents, filed Tuesday in L.A. County Superior Court. Messing is asking for joint custody of the couple's 8-year-old son, Roman. She is also asking Zelman, 44, for spousal and child support.
Messing and Zelman, an executive producer on Damages, met in graduate school and dated for 10 years before marrying in September 2000. The couple announced their separation last year, but continued living together after the fact.